65 C10 Front Backing plate removal

[Stepside6.5]

Gentlemen,

I am at a crossroads on removing the front drum brakes and swapping to Disc. I have everything removed on both sides except for the front bolt that hold the backing plate on. I have the nuts off of each one but they are not moving. I do have another question the rear bolts on the backing plates came out with little issue and are both threaded through the steering knuckle are the front two threaded through the steering knuckle?

Thanks,
Rick